1. get a copy of adaware and or Spybot Search and Destroy do a google.com search on those programs, they are both freeware.
2. Do a google search on virtual bouncer, it returned 47,000+ hits, this is just one of them.
http://www.spywareguide.com/product_show.php?SPY=514 Same deal on perfectnav, 5,100+ hits, this is just one of them
http://www.pestpatrol.com/PestInfo/p/perfectnav.asp3. "They are so annoying. what can i do" It would be nice to know what it is exactly they are doing and perhaps someone may be able to recognise the symptoms and offer a solution. However, 1 & 2 should negate that.
Although points 1 and 2 should resolve your problem, when asking for help, help us to help you by providing full information. I suggest a visit to the Off-Topic Forum and read the Users FAQ thread, this will help you and us in the future.
HTH David